Blower structure

ABSTRACT

A blower structure constituted by a rotating head composed of a protective annular band which is provided with a blunt circumferential outer flap and is connected, by way of two or more blades, to a support, the latter being constituted by a flat base from which a propeller cuff protrudes below, it being possible to key the flat base onto a motorized head of a brush cutter, each one of the blades having a shape structure that is adapted to obtain an air flow oriented toward an axis of the flat base in a direction of the propeller cuff.

The present invention relates to a blower structure.

Nowadays blowers are known which are comprised of a box-like main body,usually made of plastic material, in which an electric or gasoline motoris accommodated and with which a handle is associated; there is a switchfor switching on/off, and a lever for controlling the speed, while themain body is connected to a tube for dispensing air.

A fan is usually keyed to the shaft of the engine and is provided withradial blades, the function of which is to frontally suck air in orderto then convey it radially to the tube.

Such blowers are therefore used for example to blow leaves in a desireddirection in order to later collect them more easily in a desired area.

Such conventional solution suffers drawbacks, however: the air outputfrom the tube generates a flow that has a substantially conicalorientation with a lateral component that determines a dispersion of theproduct that the user wants to direct, which is therefore dispersedfurther, requiring further passes with the blower in order to redirectit toward the desired area, and therefore more time to carry out thework.

These lateral dispersions of the air flows further entail an expenditureof energy, thus entailing a higher consumption of fuel.

Furthermore such conventional blowers have a high purchase cost.

Such conventional blowers are further particularly heavy and must befirmly gripped and supported with one hand only by way of the handle,and therefore it is not very easy to orientate them.

In such conventional blowers there is, on the box-like main body, alateral air intake, meaning that if the user holds the blower with thehand that directs such hole toward himself, he must take care to hold itaway from his body because, in the event of contact or close approach,there is the risk of occluding the air intake for example with histrousers.

Furthermore conventional engine-driven blowers have a frontal muffler,meaning that it is possible, during use, that when the user orientatesthe blower he directs the muffler toward himself, with the attendantrisk of burns.

Finally, conventional blowers are expensive to produce.

The aim of the present application is therefore to resolve the abovementioned technical problems, eliminating the drawbacks in the citedknown art and hence devising a blower structure that makes it possibleto optimally blow for example leaves in a chosen direction withoutdispersing them further and therefore reducing the time to complete thejob.

Within this aim, another object of the invention is to devise a blowerthat can be used more easily by gripping it with two hands.

Another object is to devise a blower that is low cost to make and whichtherefore has a lower purchase cost for the user.

Another object is to devise a blower that is structurally simple and canbe used by the user while keeping it at a greater distance from his bodyeasily and with little effort.

This aim and these and other objects which will become better apparenthereinafter are achieved by a blower structure, characterized in that itis constituted by a rotating head composed of a protective annular bandwhich is provided with a blunt circumferential outer flap and isconnected, by way of two or more vanes, to a support which isconstituted by a flat base from which a propeller cuff protrudes below,it being possible to key said flat base onto a motorized head of a brushcutter, each one of said blades having a shape structure that is adaptedto obtain an air flow oriented toward an axis of such flat base in adirection of such propeller cuff

Further characteristics and advantages of the blower according to theinvention will become better apparent from the detailed description of aparticular, but not exclusive, embodiment thereof, which is illustratedby way of non-limiting example in the accompanying drawings wherein:

FIG. 1 is a perspective view of a brush cutter with a rotating headassociated;

FIG. 2 is a perspective view of a blower structure of the invention,with the rotating head removed;

FIG. 3 is a perspective view from above of the rotating head;

FIG. 4 is a perspective view from below of the rotating head;

FIG. 5 is a partially cross-sectional side view of the rotating head;

FIG. 6 is a cross-sectional view of the propeller cuff

In the embodiments illustrated, individual characteristics shown inrelation to specific examples may in reality be interchanged with other,different characteristics, existing in other embodiments.

With reference to the figures, the reference numeral 1 generallydesignates a blower structure which is constituted by a rotating head 2composed of a protective annular band 3 which is provided with a lowerend 4, an upper perimetric edge 5 and an inner lateral surface 6.

A circumferential outer flap 7 protrudes externally from the lower end 4of the protective annular band 3; it is blunt, substantially U-shaped incross-section, and can be associated with or welded to laterally orbelow the lower end 4 of the protective annular band 3.

The protective annular band 3 is connected, in the specific embodimentshown, by way of three blades 8 a, 8 b, 8 c to a support 9 constitutedby a flat base 10 from which a propeller cuff 11 protrudes below.

The height of the support 9 is substantially equal to that of theprotective annular band 3 and is therefore substantially containedwithin it.

The flat base 10 is provided axially and centrally with a hole 12,conveniently contoured, in order to allow the keying or positioningthereto of a pin 13 which protrudes from the motorized head 14 a whichis present at the end tip of a frame 14, usually tubular and providedwith two grips 15 a, 15 b, of a brush cutter 16 which comprises anengine assembly 17, electric or gasoline, for the transmission of motionto the motorized head 14 a.

The coupling of the flat base 10 to the motorized head 14 a in factmakes it possible to rotate the rotating head 2, usually anticlockwise.

In fact the motorized head 14 a can be accommodated within a cavity 14 bwhich is provided on the flat base 10 concentrically to the hole 12,while the pin 13 is externally threaded for connection to acomplementarily threaded nut 14 c which can be accommodated within acomplementarily shaped seat 14 d which is provided on the propeller cuff11 coaxially to the hole 12.

Each blade 8 a, 8 b, 8 c has a curved shape, with the concavity facingaway from the propeller cuff 11.

Each blade 8 a, 8 b, 8 c has a first, upper point of attachment 18 a, 18b, 18 c arranged proximate to or at an outer perimetric edge 19 of theflat base 10 or at a lateral surface 20 of the propeller cuff 11;subsequently each blade has an extension that brings it to riseupwardly, higher than the plane of arrangement of the flat base 10, andtherefore also of the upper perimetric edge 5 of the protective annularband 3, in order to then descend downwardly in the direction of theinner lateral surface 6, until it connects at or proximate to the upperperimetric edge 5 of the protective annular band 3.

Each blade 8 a, 8 b, 8 c has a second, lower point of attachment 21 a,21 b, 21 c arranged proximate to or at the outer perimetric edge 19 ofthe flat base 10 or at the lateral surface 20 of the propeller cuff 11;subsequently each blade has a shape structure that brings it to descenddownwardly in the direction of the inner lateral surface 6, until itconnects proximate to or at the lower end 4 of the protective annularband 3.

Each one of the blades 8 a, 8 b, 8 c, once the blower structure 1 is putinto operation, generates a flow that is oriented substantially towardthe axis of the flat base 10 in the direction of the propeller cuff 11,thanks to their particular shape structure.

It follows from this that the overall flow of air generated by the threeblades 8 a, 8 b, 8 c of the rotating head 2 is arranged substantiallyaccording to a cylindrical canalization.

Thus it has been found that the invention fully achieves the intendedaim and objects, a blower structure 1 being obtained which concentratesthe determination of the flow of air in a narrow area that is central tothe rotating head, thus eliminating the lateral dispersion of air flows,all thanks to the shape structure of the blades 8 a, 8 b, 8 c whichdrive the air toward the center.

The air flow that is obtained therefore makes it possible to optimallyblow for example leaves in a chosen direction without dispersing themfurther and therefore reducing the time to complete the job.

The blower can also be used by the user while keeping it at a greaterdistance from his body easily and with little effort.

The blower further requires a lower expenditure of energy, for the samework, thus requiring further less time to carry out the work.

The purchase costs of the blower structure 1 are lower than those ofconventional blowers, since the user can also use a brush cutter whichis already in his possession, simply by adding the rotating head 2 andconnecting it thereto.

Furthermore, by using the coupling of the blower structure 1 with thebrush cutter 16, the problem of conventional blowers of gripping it withone hand only is eliminated, since there are two grips 15 a, 15 b in itwhich enable the user to hold and use the blower with two hands, makingthe work simpler and less tiring.

The presence of the double grip 15 a, 15 b of the blower according tothe invention further makes it possible to use a blower under conditionsof utmost safety given that the blower structure 1 connected to thebrush cutter 16 can be held at a greater distance from the body of theuser, thus reducing considerably the risk of burns.

The invention is susceptible of numerous modifications and variations,all of which are within the scope of the appended claims. Obviously thematerials used as well as the dimensions of the individual components ofthe invention may be more relevant according to specific requirements.The characteristics indicated above as advantageous, convenient or thelike, may also be missing or be substituted by equivalentcharacteristics.

The disclosures in Italian Utility Model Application No. MI2015U000093(202015902346964) from which this application claims priority areincorporated herein by reference.

What is claimed is:
 1. A blower structure, constituted by a rotatinghead composed of a protective annular band which is provided with ablunt circumferential outer flap and is connected, by way of two or morevanes, to a support which is constituted by a flat base from which apropeller cuff protrudes below, said flat base being keyed onto amotorized head of a brush cutter, each one of said blades having a shapestructure that is adapted to obtain an air flow oriented toward an axisof said flat base in a direction of said propeller cuff
 2. The blowerstructure according to claim 1, wherein said protective annular band hasa lower end, an upper perimetric edge, and an inner lateral surface,said blunt circumferential outer flap protruding externally from saidlower end and having a substantially U-shaped cross-section, and beingassociated with or welded to laterally or below said lower end of saidprotective annular band.
 3. The blower structure according to claim 1,wherein a height of said support is substantially equal to that of saidprotective annular band and is substantially contained therein.
 4. Theblower structure according to claim 1, wherein said flat base isprovided axially and centrally with a hole, in order to allow thepositioning within said hole of a pin which protrudes from saidmotorized head which is present at an end tip of a frame, provided withtwo grips, of a brush cutter which comprises an engine assembly for thetransmission of motion to said motorized head.
 5. The blower structureaccording to claim 1, wherein in said hole it is possible to arrange apin which protrudes from said motorized head which can be accommodatedwithin a cavity which is provided on said flat base concentrically tosaid hole, said pin being externally threaded for connection to acomplementarily threaded nut which can be accommodated within acomplementarily shaped seat which is provided on said propeller cuffcoaxially to said hole.
 6. The blower structure according to claim 1,wherein each one of said blades has a first, upper point of attachmentarranged proximate to or at an outer perimetric edge of said flat baseor at a lateral surface of said propeller cuff, subsequently each one ofsaid blades having an extension that brings it to rise upwardly, higherthan the plane of arrangement of said flat base, and therefore also saidupper perimetric edge of said protective annular band, in order to thendescend downwardly in the direction of said inner lateral surface, untilit connects at or proximate to said upper perimetric edge of saidprotective annular band.
 7. The blower structure according to claim 6,wherein each one of said blades has a second, lower point of attachmentarranged proximate to or at said outer perimetric edge of said flat baseor at said lateral surface of said propeller cuff, subsequently each oneof said blades having a shape structure that brings it to descenddownwardly in the direction of said inner lateral surface, until itconnects proximate to or at said lower end of said protective annularband.
 8. The blower structure according to claim 1, wherein the flow ofair generated overall by said blades of said rotating head is arrangedsubstantially according to a cylindrical canalization.